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Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS), with a target of March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

Experimental National Water Center Products: Flood Inundation Mapping services are now available for 10% of the U.S. population. Please visit https://www.weather.gov/owp/operations for more information. The National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via the URL above, as described in the StoryMap here.



Hydrograph River at a Glance Download
Millstone River at Griggstown Stage (ft)Observed: 6.21 ft at 10:00AM Sep 27, 2023Observed: 6.18 ft at 10:15AM Sep 27, 2023Observed: 6.16 ft at 10:30AM Sep 27, 2023Observed: 6.15 ft at 10:45AM Sep 27, 2023Observed: 6.14 ft at 11:00AM Sep 27, 2023Observed: 6.12 ft at 11:15AM Sep 27, 2023Observed: 6.11 ft at 11:30AM Sep 27, 2023Observed: 6.08 ft at 11:45AM Sep 27, 2023Observed: 6.07 ft at 12:00PM Sep 27, 2023Observed: 6.06 ft at 12:15PM Sep 27, 2023Observed: 6.04 ft at 12:30PM Sep 27, 2023Observed: 6.03 ft at 12:45PM Sep 27, 2023Observed: 6.02 ft at 1:00PM Sep 27, 2023Observed: 6 ft at 1:15PM Sep 27, 2023Observed: 5.98 ft at 1:30PM Sep 27, 2023Observed: 5.97 ft at 1:45PM Sep 27, 2023Observed: 5.95 ft at 2:00PM Sep 27, 2023Observed: 5.94 ft at 2:15PM Sep 27, 2023Observed: 5.92 ft at 2:30PM Sep 27, 2023Observed: 5.9 ft at 2:45PM Sep 27, 2023Observed: 5.9 ft at 3:00PM Sep 27, 2023Observed: 5.87 ft at 3:15PM Sep 27, 2023Observed: 5.86 ft at 3:30PM Sep 27, 2023Observed: 5.85 ft at 3:45PM Sep 27, 2023Observed: 5.84 ft at 4:00PM Sep 27, 2023Observed: 5.82 ft at 4:15PM Sep 27, 2023Observed: 5.81 ft at 4:30PM Sep 27, 2023Observed: 5.79 ft at 4:45PM Sep 27, 2023Observed: 5.72 ft at 6:00PM Sep 27, 2023Observed: 5.7 ft at 6:15PM Sep 27, 2023Observed: 5.69 ft at 6:30PM Sep 27, 2023Observed: 5.67 ft at 6:45PM Sep 27, 2023Observed: 5.65 ft at 7:00PM Sep 27, 2023Observed: 5.64 ft at 7:15PM Sep 27, 2023Observed: 5.62 ft at 7:30PM Sep 27, 2023Observed: 5.6 ft at 7:45PM Sep 27, 2023Observed: 5.59 ft at 8:00PM Sep 27, 2023Observed: 5.58 ft at 8:15PM Sep 27, 2023Observed: 5.57 ft at 8:30PM Sep 27, 2023Observed: 5.55 ft at 8:45PM Sep 27, 2023Observed: 5.53 ft at 9:00PM Sep 27, 2023Observed: 5.52 ft at 9:15PM Sep 27, 2023Observed: 5.5 ft at 9:30PM Sep 27, 2023Observed: 5.49 ft at 9:45PM Sep 27, 2023Observed: 5.48 ft at 10:00PM Sep 27, 2023Observed: 5.47 ft at 10:15PM Sep 27, 2023Observed: 5.45 ft at 10:30PM Sep 27, 2023Observed: 5.44 ft at 10:45PM Sep 27, 2023Observed: 5.42 ft at 11:00PM Sep 27, 2023Observed: 5.42 ft at 11:15PM Sep 27, 2023Observed: 5.4 ft at 11:30PM Sep 27, 2023Observed: 5.38 ft at 11:45PM Sep 27, 2023Observed: 5.37 ft at 12:00AM Sep 28, 2023Observed: 5.36 ft at 12:15AM Sep 28, 2023Observed: 5.35 ft at 12:30AM Sep 28, 2023Observed: 5.34 ft at 12:45AM Sep 28, 2023Observed: 5.32 ft at 1:00AM Sep 28, 2023Observed: 5.31 ft at 1:15AM Sep 28, 2023Observed: 5.3 ft at 1:30AM Sep 28, 2023Observed: 5.29 ft at 1:45AM Sep 28, 2023Observed: 5.28 ft at 2:00AM Sep 28, 2023Observed: 5.26 ft at 2:15AM Sep 28, 2023Observed: 5.26 ft at 2:30AM Sep 28, 2023Observed: 5.24 ft at 2:45AM Sep 28, 2023Observed: 5.23 ft at 3:00AM Sep 28, 2023Observed: 5.22 ft at 3:15AM Sep 28, 2023Observed: 5.2 ft at 3:30AM Sep 28, 2023Observed: 5.19 ft at 3:45AM Sep 28, 2023Observed: 5.18 ft at 4:00AM Sep 28, 2023Observed: 5.17 ft at 4:15AM Sep 28, 2023Observed: 5.16 ft at 4:30AM Sep 28, 2023Observed: 5.14 ft at 4:45AM Sep 28, 2023Observed: 5.14 ft at 5:00AM Sep 28, 2023Observed: 5.12 ft at 5:15AM Sep 28, 2023Observed: 5.11 ft at 5:30AM Sep 28, 2023Observed: 5.09 ft at 5:45AM Sep 28, 2023Observed: 5.08 ft at 6:00AM Sep 28, 2023Observed: 5.07 ft at 6:15AM Sep 28, 2023Observed: 5.06 ft at 6:30AM Sep 28, 2023Observed: 5.05 ft at 6:45AM Sep 28, 2023Observed: 5.04 ft at 7:00AM Sep 28, 2023Observed: 5.02 ft at 7:15AM Sep 28, 2023Observed: 5.02 ft at 7:30AM Sep 28, 2023Observed: 5 ft at 7:45AM Sep 28, 2023Observed: 4.99 ft at 8:00AM Sep 28, 2023Observed: 4.98 ft at 8:15AM Sep 28, 2023Observed: 4.97 ft at 8:30AM Sep 28, 2023Observed: 4.96 ft at 8:45AM Sep 28, 2023Observed: 4.95 ft at 9:00AM Sep 28, 2023Observed: 4.93 ft at 9:15AM Sep 28, 2023Observed: 4.92 ft at 9:30AM Sep 28, 2023Observed: 4.91 ft at 9:45AM Sep 28, 2023Observed: 4.9 ft at 10:00AM Sep 28, 2023Observed: 4.89 ft at 10:15AM Sep 28, 2023Observed: 4.89 ft at 10:30AM Sep 28, 2023Observed: 4.88 ft at 10:45AM Sep 28, 2023Observed: 4.87 ft at 11:00AM Sep 28, 2023Observed: 4.86 ft at 11:15AM Sep 28, 2023Observed: 4.86 ft at 11:30AM Sep 28, 2023Observed: 4.85 ft at 11:45AM Sep 28, 2023Observed: 4.84 ft at 12:00PM Sep 28, 2023Observed: 4.83 ft at 12:15PM Sep 28, 2023Observed: 4.82 ft at 12:30PM Sep 28, 2023Observed: 4.82 ft at 12:45PM Sep 28, 2023Observed: 4.81 ft at 1:00PM Sep 28, 2023Observed: 4.8 ft at 1:15PM Sep 28, 2023Observed: 4.8 ft at 1:30PM Sep 28, 2023Observed: 4.79 ft at 1:45PM Sep 28, 2023Observed: 4.78 ft at 2:00PM Sep 28, 2023Observed: 4.78 ft at 2:15PM Sep 28, 2023Observed: 4.77 ft at 2:30PM Sep 28, 2023Observed: 4.76 ft at 2:45PM Sep 28, 2023Observed: 4.76 ft at 3:00PM Sep 28, 2023Observed: 4.75 ft at 3:15PM Sep 28, 2023Observed: 4.75 ft at 3:30PM Sep 28, 2023Observed: 4.75 ft at 3:45PM Sep 28, 2023Observed: 4.73 ft at 4:00PM Sep 28, 2023Observed: 4.73 ft at 4:15PM Sep 28, 2023Observed: 4.72 ft at 4:30PM Sep 28, 2023Observed: 4.72 ft at 4:45PM Sep 28, 2023Observed: 4.71 ft at 5:00PM Sep 28, 2023Observed: 4.7 ft at 5:15PM Sep 28, 2023Observed: 4.7 ft at 5:30PM Sep 28, 2023Observed: 4.69 ft at 5:45PM Sep 28, 2023Observed: 4.69 ft at 6:00PM Sep 28, 2023Observed: 4.68 ft at 6:15PM Sep 28, 2023Observed: 4.68 ft at 6:30PM Sep 28, 2023Observed: 4.67 ft at 6:45PM Sep 28, 2023Observed: 4.66 ft at 7:00PM Sep 28, 2023Observed: 4.66 ft at 7:15PM Sep 28, 2023Observed: 4.64 ft at 7:30PM Sep 28, 2023Observed: 4.64 ft at 7:45PM Sep 28, 2023Observed: 4.64 ft at 8:00PM Sep 28, 2023Observed: 4.63 ft at 8:15PM Sep 28, 2023Observed: 4.62 ft at 8:30PM Sep 28, 2023Observed: 4.62 ft at 8:45PM Sep 28, 2023Observed: 4.61 ft at 9:00PM Sep 28, 2023Observed: 4.6 ft at 9:15PM Sep 28, 2023Observed: 4.6 ft at 9:30PM Sep 28, 2023Observed: 4.59 ft at 9:45PM Sep 28, 2023Observed: 4.6 ft at 10:00PM Sep 28, 2023Observed: 4.59 ft at 10:15PM Sep 28, 2023Observed: 4.59 ft at 10:30PM Sep 28, 2023Observed: 4.58 ft at 10:45PM Sep 28, 2023Observed: 4.57 ft at 11:00PM Sep 28, 2023Observed: 4.57 ft at 11:15PM Sep 28, 2023Observed: 4.57 ft at 11:30PM Sep 28, 2023Observed: 4.56 ft at 11:45PM Sep 28, 2023Observed: 4.56 ft at 12:00AM Sep 29, 2023Observed: 4.55 ft at 12:15AM Sep 29, 2023Observed: 4.55 ft at 12:30AM Sep 29, 2023Observed: 4.55 ft at 12:45AM Sep 29, 2023Observed: 4.54 ft at 1:00AM Sep 29, 2023Observed: 4.54 ft at 1:15AM Sep 29, 2023Observed: 4.54 ft at 1:30AM Sep 29, 2023Observed: 4.53 ft at 1:45AM Sep 29, 2023Observed: 4.54 ft at 2:00AM Sep 29, 2023Observed: 4.53 ft at 2:15AM Sep 29, 2023Observed: 4.53 ft at 2:30AM Sep 29, 2023Observed: 4.53 ft at 2:45AM Sep 29, 2023Observed: 4.53 ft at 3:00AM Sep 29, 2023Observed: 4.54 ft at 3:15AM Sep 29, 2023Observed: 4.54 ft at 3:30AM Sep 29, 2023Observed: 4.54 ft at 3:45AM Sep 29, 2023Observed: 4.54 ft at 4:00AM Sep 29, 2023Observed: 4.55 ft at 4:15AM Sep 29, 2023Observed: 4.55 ft at 4:30AM Sep 29, 2023Observed: 4.55 ft at 4:45AM Sep 29, 2023Observed: 4.56 ft at 5:00AM Sep 29, 2023Observed: 4.56 ft at 5:15AM Sep 29, 2023Observed: 4.57 ft at 5:30AM Sep 29, 2023Observed: 4.57 ft at 5:45AM Sep 29, 2023Observed: 4.59 ft at 6:00AM Sep 29, 2023Observed: 4.6 ft at 6:15AM Sep 29, 2023Observed: 4.62 ft at 6:30AM Sep 29, 2023Observed: 4.65 ft at 6:45AM Sep 29, 2023Observed: 4.67 ft at 7:00AM Sep 29, 2023Observed: 4.7 ft at 7:15AM Sep 29, 2023Observed: 4.73 ft at 7:30AM Sep 29, 2023Observed: 4.76 ft at 7:45AM Sep 29, 2023Observed: 4.8 ft at 8:00AM Sep 29, 2023Observed: 4.83 ft at 8:15AM Sep 29, 2023Observed: 4.88 ft at 8:30AM Sep 29, 2023Observed: 4.93 ft at 8:45AM Sep 29, 2023Observed: 4.98 ft at 9:00AM Sep 29, 2023Observed: 5.05 ft at 9:15AM Sep 29, 2023Observed: 5.22 ft at 9:30AM Sep 29, 2023Observed: 5.34 ft at 9:45AM Sep 29, 2023Observed: 5.64 ft at 10:00AM Sep 29, 2023Observed: 5.8 ft at 10:15AM Sep 29, 2023Observed: 6 ft at 10:30AM Sep 29, 2023Observed: 6.25 ft at 10:45AM Sep 29, 2023Observed: 6.48 ft at 11:00AM Sep 29, 2023Observed: 6.77 ft at 11:15AM Sep 29, 2023Observed: 7.36 ft at 11:30AM Sep 29, 2023Observed: 7.6 ft at 11:45AM Sep 29, 2023Observed: 7.81 ft at 12:00PM Sep 29, 2023Observed: 8.03 ft at 12:15PM Sep 29, 2023Observed: 8.22 ft at 12:30PM Sep 29, 2023Observed: 8.38 ft at 12:45PM Sep 29, 2023Observed: 8.52 ft at 1:00PM Sep 29, 2023Observed: 8.64 ft at 1:15PM Sep 29, 2023Observed: 8.73 ft at 1:30PM Sep 29, 2023Observed: 8.81 ft at 1:45PM Sep 29, 2023Observed: 8.89 ft at 2:00PM Sep 29, 2023Observed: 8.95 ft at 2:15PM Sep 29, 2023Observed: 9 ft at 2:30PM Sep 29, 2023Observed: 9.04 ft at 2:45PM Sep 29, 2023Observed: 9.07 ft at 3:00PM Sep 29, 2023Observed: 9.1 ft at 3:15PM Sep 29, 2023Observed: 9.12 ft at 3:30PM Sep 29, 2023Observed: 9.13 ft at 3:45PM Sep 29, 2023Highest Observation: 9.15 ft at 4:00PM Sep 29, 2023Highest Observation: 9.15 ft at 4:15PM Sep 29, 2023Highest Observation: 9.15 ft at 4:30PM Sep 29, 2023Highest Observation: 9.15 ft at 4:45PM Sep 29, 2023Observed: 9.14 ft at 5:00PM Sep 29, 2023Observed: 9.14 ft at 5:15PM Sep 29, 2023Observed: 9.13 ft at 5:30PM Sep 29, 2023Observed: 9.12 ft at 5:45PM Sep 29, 2023Observed: 9.1 ft at 6:00PM Sep 29, 2023Observed: 9.08 ft at 6:15PM Sep 29, 2023Observed: 9.06 ft at 6:30PM Sep 29, 2023Observed: 9.04 ft at 6:45PM Sep 29, 2023Observed: 9.02 ft at 7:00PM Sep 29, 2023Observed: 9 ft at 7:15PM Sep 29, 2023Observed: 8.98 ft at 7:30PM Sep 29, 2023Observed: 8.96 ft at 7:45PM Sep 29, 2023Observed: 8.94 ft at 8:00PM Sep 29, 2023Observed: 8.93 ft at 8:15PM Sep 29, 2023Observed: 8.91 ft at 8:30PM Sep 29, 2023Observed: 8.88 ft at 8:45PM Sep 29, 2023Observed: 8.87 ft at 9:00PM Sep 29, 2023Observed: 8.85 ft at 9:15PM Sep 29, 2023Observed: 8.83 ft at 9:30PM Sep 29, 2023Observed: 8.82 ft at 9:45PM Sep 29, 2023Observed: 8.8 ft at 10:00PM Sep 29, 2023Observed: 8.78 ft at 10:15PM Sep 29, 2023Observed: 8.77 ft at 10:30PM Sep 29, 2023Observed: 8.76 ft at 10:45PM Sep 29, 2023Observed: 8.75 ft at 11:00PM Sep 29, 2023Observed: 8.73 ft at 11:15PM Sep 29, 2023Observed: 8.72 ft at 11:30PM Sep 29, 2023Observed: 8.7 ft at 11:45PM Sep 29, 2023Observed: 8.69 ft at 12:00AM Sep 30, 2023Observed: 8.68 ft at 12:15AM Sep 30, 2023Observed: 8.67 ft at 12:30AM Sep 30, 2023Observed: 8.66 ft at 12:45AM Sep 30, 2023Observed: 8.65 ft at 1:00AM Sep 30, 2023Observed: 8.64 ft at 1:15AM Sep 30, 2023Observed: 8.63 ft at 1:30AM Sep 30, 2023Observed: 8.61 ft at 1:45AM Sep 30, 2023Observed: 8.61 ft at 2:00AM Sep 30, 2023Observed: 8.6 ft at 2:15AM Sep 30, 2023Observed: 8.59 ft at 2:30AM Sep 30, 2023Observed: 8.58 ft at 2:45AM Sep 30, 2023Observed: 8.57 ft at 3:00AM Sep 30, 2023Observed: 8.56 ft at 3:15AM Sep 30, 2023Observed: 8.54 ft at 3:30AM Sep 30, 2023Observed: 8.53 ft at 3:45AM Sep 30, 2023Observed: 8.52 ft at 4:00AM Sep 30, 2023Observed: 8.51 ft at 4:15AM Sep 30, 2023Observed: 8.5 ft at 4:30AM Sep 30, 2023Observed: 8.49 ft at 4:45AM Sep 30, 2023Observed: 8.48 ft at 5:00AM Sep 30, 2023Observed: 8.46 ft at 5:15AM Sep 30, 2023Observed: 8.45 ft at 5:30AM Sep 30, 2023Observed: 8.45 ft at 5:45AM Sep 30, 2023Observed: 8.43 ft at 6:00AM Sep 30, 2023Observed: 8.43 ft at 6:15AM Sep 30, 2023Observed: 8.41 ft at 6:30AM Sep 30, 2023Observed: 8.4 ft at 6:45AM Sep 30, 2023Observed: 8.39 ft at 7:00AM Sep 30, 2023Observed: 8.38 ft at 7:15AM Sep 30, 2023Observed: 8.37 ft at 7:30AM Sep 30, 2023Observed: 8.36 ft at 7:45AM Sep 30, 2023Observed: 8.34 ft at 8:00AM Sep 30, 2023Observed: 8.33 ft at 8:15AM Sep 30, 2023Observed: 8.32 ft at 8:30AM Sep 30, 2023Observed: 8.31 ft at 8:45AM Sep 30, 2023USGS--Water Resources of the United StatesGTNN4(plotting HGIRG) Graph Created (9:48AM Sep 30, 2023)ObservedLatest observed value: 8.31 ft at 8:45 AM EDT 30-Sep-2023. Flood Stage is 10 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: NGVD29
Metadata
NOTE: Forecasts are not available for the Millstone River at Griggstown. Only observed stages are available for this point.
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Downstream Gauge Downstream Gauge - at Blackwells Mills
Flood Categories (in feet)
Major Flood Stage: 15
Moderate Flood Stage: 12
Flood Stage: 10
Action Stage: 9.5
Low Stage (in feet): 0

Historic Crests
(1) 24.21 ft on 08/28/2011
(2) 23.36 ft on 09/02/2021
(3) 23.20 ft on 09/16/1999
(4) 22.70 ft on 08/28/1971
(5) 22.16 ft on 04/16/2007
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 13.91 ft on 04/08/2022
(2) 23.36 ft on 09/02/2021
(3) 17.24 ft on 08/23/2021
(4) 11.45 ft on 07/30/2021
(5) 11.56 ft on 03/02/2021
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to www.floodsmart.gov.
Zoom Level:16
KML Image
Gauge LocationGauge Map Marker
 Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
15 River Road flooding expands. The road closes between Grist Mill Drive and the Millstone Causway. Canal Road in Franklin Township floods.
12 River Road flooding expands near the Griggstown Causeway and begins south of Dead Tree Run Road.
10 River Road in Montgomery Township begins to flood near the Griggstown Causeway.
9.5 Griggstown Causeway is closed.
About This Location Collapse

Latitude: 40.440000° N, Longitude: 74.617500° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 10 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)		 Elevation
(gauge height = flood stage)		 Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 26.52 36.52 Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:
Additional Information Collapse
During winter months, cold and ice may result in inaccurate real-time stream stage and streamflow data. Adjustments or deletions of this data can only be done after detailed analysis.
Resources Collapse
Hydrologic Resources Additional Resources
Collaborative Agencies Collapse
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
Philadelphia/Mount Holly Weather Forecast Office
732 Woodlane Road
Mount Holly, NJ 08060-9615
(609) 261-6600
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